android – Can gesture detector decide if a consumer was already urgent down earlier than dragging onto a widget?

I created a Flutter gridview of containers and every one makes use of an onTap detector to vary shade, however I need to have dragging performance to vary a number of containers at a time with out lifting the pointer.

present state

Right here is my container class that makes use of OnTap:

class CalendarBox extends StatelessWidget {
  closing little one;
  bool chosen;
  closing operate;

  CalendarBox({this.little one, required this.chosen, this.operate});

  @override
  Widget construct(BuildContext context) {
    return GestureDetector(
      onTap: operate,
      little one: Container(
        // shade: Colours.blue,
        ornament: BoxDecoration(
            shade: chosen ? Colours.inexperienced : Colours.gray,
            border: Border.all(shade: Colours.black, width: 0.2)),
        // shade: Colours.blue,
        little one: Middle(little one: Textual content(little one.toString())),
      ),
    );
    ;
  }
}

that is the gridview that builds the containers:

Container(
            width: 290,
            top: 600,
            little one: GridView.builder(
                physics: NeverScrollableScrollPhysics(),
                itemCount: calendarBoxCount,
                gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
                  mainAxisSpacing: 0,
                  crossAxisSpacing: 0,
                  crossAxisCount: calendarBoxInEachRow,
                  childAspectRatio: (20 / 10),
                ),
                itemBuilder: (context, index) {
                  return CalendarBox(
                    little one: index,
                    chosen: boxStatus[index],
                    operate: () {
                      //pointer detected on field turns field inexperienced
                      selectBox(index);
                    },
                  );
                }),
          ),